Is there a way to objectively measure

pain? Like, if you hit your finger with a hammer you suffer 5.7 units of pain?

poster of >12 here. so maybe my vague examples weren't so great, but i was just trying to get across the idea that humans, for all we know, are essentially entirely material, and thus with sensors of sufficient precision and computers of sufficient processing power we should be able to know exactly (or atleast probably) what anyone is thinking or feeling at any given time.
Pain, and how the body perceives the pain, are entirely physical sensations/processes. So of course they can be measured, and i do believe the technology to quickly produce sufficiently accurate tools exist today to collect and process that data from a human.
And I'm guessing collecting such data would be done primarily from neurons as they are the fundamental units of our nervous system which ultimately deal with all thought and sensation we have.
capiche?